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1、www.ks5u.com葫芦岛市第一高级中学课外拓展训练高二英语学科阅读理解Scientistshavebeeninterestedforyearsintheobservationthatratios(比率)offingerlengthsdifferinmenandwomen.Inmen,thering(fourth)fingerisusuallylongerthantheindex(second);theirsocalled2D∶4Dratioislowerthan1.Infemales,thetwo
2、fingersaremorelikelytobethesamelength.Becauseofthissexdifferences,somescientistsbelievethatalowratiocouldbeamarkerforhigherprenatalhormone(产前激素)levels,althoughit'snotclearhowthehormonemightinfluencefingerdevelopment.The2D∶4Dratiohasalsobeenfingeredinconn
3、ectionwithbrainrelatedcharacteristics—mostofteninmales—suchasdepression,lefthandedness,musicalability,andhomosexuality.Inthelatestsuchstudy,psychologistMarkBrosnanandcolleaguesattheUniversityofBathintheUnitedKingdomphotocopiedthehandsof74boysandgirlsaged
4、6and7.Theycomparedthemeasurementsofthesecondandfourthfingerswiththechildren'sscoresonastandardUKtestofmathandliteracy.Inboys,thelowertheratio,thebettertheirmathscore,theteamreportsintheMayissueoftheBritishJournalofPsychology.Theboyswiththelowestratiosals
5、oweretheoneswhoseabilitiesweremostskewedinthedirectionofmathratherthanliteracy.Thesedifferencesaresmallbutsignificant,saysBrosnan.Withthegirls,therewasnocorrelationbetweenfingerrationandnumeracy,butthosewithhigherratios—probablyindicatinglowhormonelevels
6、—hadbetterscoresonverbalabilities.Thesesexspecificcorrelationsshowhowtrickyitistodefinetherolesofsexhormones,sayspsychologistS．MarcBreedloveofMichiganStateUniversityinEastLansing.Therangeofnormallevelsofthehormoneisdifferentinmalesandfemales,socomparable
7、levelswouldhaveverydifferentmeaningsdependingonthesexoftheindividual.Andthetimingofhormonesurgesisasimportantaslevels.-6-Nevertheless,Brosnanbelievesfingermeasurementsmightbeusefulforpredictingcognitiveabilities—althoughheacknowledgesthat“wearenotsuggest
8、ingthatfingerlengthmeasurementscouldreplaceSATtests”.Othersaremorecautious,pointingoutthatscientistsstillhavenotconfirmedthatfingerratioisareliablemarkerforprenatalhormonelevels.1.Whatcanwelearnfromthefirstparagraph?A.Scie
